Mezmerize DCB1 Building Thread - Page 56 - diyAudio
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Old 6th May 2012, 08:46 PM   #551
atupi is online now atupi  Romania
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Salas thanks for your inspiration, i've found the problem and like always was an human error in the pcb design. Now my buffer sings very very nice and makes a nice team with the Simplistic Riaa
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Old 6th May 2012, 09:53 PM   #552
Salas is online now Salas  Greece
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Excellent. Enjoy.
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Old 13th May 2012, 10:55 AM   #553
atupi is online now atupi  Romania
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After building and testing the DCB1 with plain resistors i want to buy some better quality resistors (mainly for buffer part) and i ask you what to choose (preferably from Mouser ).

What about CF1/4CT52R221G KOA Speer Carbon Film Resistors - Through Hole

or these

RN55C2200BRE6 Vishay/Dale Metal Film Resistors - Through Hole

If you have some other sugestion i'm open to something else.
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Old 13th May 2012, 11:02 AM   #554
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Snake oil territory - beware.

The Vishay RN55 are pretty good.
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Old 13th May 2012, 11:05 AM   #555
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metal film, 1%, 25 or 50ppm/C, all copper connections (non iron, Fe) are very good.
0.1% and 15ppm are not worth paying the extra for unless the circuit specifically requires those.
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Old 13th May 2012, 11:11 AM   #556
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I used DALE 1% Metal Films in the signal path.

There was much more improvement to made with the caps.

I used Siemens 1.0uF MKP caps at the input and Oblligato 10uF PIOs at the output.

Again, the difference is subtle and definite snake oil territory.

You wont fit these caps on a Mesmorize board though. I used a homebrew clone of the original B1 board.

The resistors at the bottom right of the board are not in the signal path so I just used good quality 1% metal films there.

I can't find the original photo so I'll post it again - Apologies to the Moderators.


I eventually used the Mesmorise board as a Salas shunt reg with my homebrew Pass B1 boards.
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File Type: jpg DSIR9373.JPG (183.3 KB, 342 views)

Last edited by KatieandDad; 13th May 2012 at 11:38 AM.
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Old 13th May 2012, 11:38 AM   #557
atupi is online now atupi  Romania
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Forgot to ask you if worth to buy some BL grade transistors if i have matched GR transistors with Idss around 5.5
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Old 13th May 2012, 11:40 AM   #558
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I used these

eBay - The UK's Online Marketplace

Whether you will notice any difference is up to you.
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Old 13th May 2012, 11:46 AM   #559
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Guys I am waiting for some mesmerize boards I got from the diyaudio store and I am currently planning on the rest of the parts.
What I was wondering is if there is a way to get two outputs from the board, so that I can drive 4 monoblock amps (dual - dual mono setup driving woofers and mid-twitters separately)
Thanks a lot
Dimitri
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Old 13th May 2012, 11:47 AM   #560
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I've listened to KOA Carbon Films and Dale CMF55, and prefer the Dales. The Carbon Films were too smooth for me.
There is very little in the signal path here, so resistors are about the only thing to change.
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